This program is unnecessary process to the running of the program, but should not be terminated unless suspected to be causing problems. It will also provide CD/DVD access for any user under Windows 2000/XP.
Non-system processes like nmsaccessu.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that over time your registry suffers fragmentation and accumulates invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues